John caiiall



J. CAHALL.

(No Model.)

BOILER.

N0. 485,087. Patented Oct; 25, 1892..

UNiTED STATES PATENT OEEIcE.

JOHN OAI-IALL, OF MANSFIELD, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO H. E. OAI-IALL AND XV. H. OAHALL, OF SAME PLACE.

BOILER.

SPECIFICATION forming part of Letters Patent No. 485,087, dated October 25, 1892.

Application filed August 3, 1892. l

To all whom it may concern:

Be it known that I, JOHN CAHALL, a citizen of the United States, and a resident of Mansfield, in the county of Richland and State of Ohio, haveinvented certain new and usefullmprovements in Boilers; and Ido hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in steam-boilers designed to utilize the waste or superfluous heat generated in a puddling or heating furnace; and the objects of the invention are, first, to provide for uniformly heating all of the water tubes or pipes and effectually consuming all of the products of combustion escaping from the furnace, and,

secondly, to provide for superheating the steam in the steam-drum and to so arrange the water-tubes that any sediment forming in any of them will pass into a mud-drum, from which it can be easily and readily removed.

With these and other ends in view my invention consists of an exterior shell, a muddrum arranged in the bottom of said shell and provided with a central vertical flue or passage through which the superiiuous heat, dac., generatedin asuitable furnace are adapted to pass, a steam-drum situated within the shell near the upper end thereof, but out of contact therewith, to form a passage around said drum,which passage communicates with the smoke-stack and with the interior of the boiler, and a series of water-tubes connecting the mud and steam drums, said pipes being inclined inwardly or toward the center of the boiler from their lower to their upper ends to provide a central conical combustion-chamber, which communicates at its lower end or base with the central vertical flue in the muddrum.

My invention further consists in the peculiar construction and arrangement of parts, as will be hereinafter more fully pointed out and claimed.

In the accompanying drawings, Figure l is Serial No. 442,031. (No model.)

a vertical sectional View of aboiler constructed in accordance with my invention. Fig. 2 is a sectional plan view on the line of Fig. 1.

Like letters of reference denote corresponding parts in both figures of the drawings, referring to which- A designates the outer wall or shell of my improved boiler, which is shown as supported on a base-plate B, mounted on short upright standards or posts C. Y

Within the shell A, at the lower end thereof, is securely mounted a mud-drum D, which is provided with a central vertical iiue or passage E. The vertical passage E in the muddrum is lined with a lining F of fire-brick or similar material, and said passage 4communicates at its lower end with the stack of a puddling or heating furnace. (Not shown.) The interior of the shell A above the muddrum D is provided with alining of firebrick G.

Within the shell A are arranged a series of water tubes or pipes H, which pipes are arranged in concentric rows around the upper end or mouth of the central vertical passage E in the mud-drum, and said tubes are inclined inwardly from their lower to their upper ends to form a central conical or tapering combustion-chamber K. The diameter of the widest part of the central combustionchamber K is slightly greater than the interior diameter of the vertical passage in the mud-drum, and all of the products of coinbustion and heat escaping from the furnace are conducted into said conical combustionchamber through the passage in the muddrum. The upper ends of the tubes H communicate with a steam-drum L, supported thereby, and said drum is strengthened by means of a series o f internal braces M. These braces are preferably made in the manner shown in the drawings, in which the adjacent ends of rods M, attached, respectively, to the top and bottom of the steamdrum, are connected by means of turnbuckles n. As shown, the braces, preferably four in number, have their lower members 'm diverg` ing from a common point or center, and from such central point ashort rod extends through thebottom of the steam-drum and is provided in its lower end with a suitable internallythreaded socket adapted to receive the upper threaded end of a depending rod M, or any other suitable means may be employed for rigidly supporting said central vertical rod from the steam-drum or the braces therein.

The lower end of the rod M is rigidly attached to a deflector N, arranged centrally above the passage in the mud-drum and adapted to deflect the products ofcombustion, dac., escaping through said passage, through and between the water-tubes II. The deectorN is preferably made triangular in cross-section, as shown, and said deflector is held rmlyin place within the central conical combustioncharnber by means of transverse braces O, attached to the depending rod M and to certain of the inner row or circle of water-tubes.

The external wall or shell A of the boiler is of uniform thickness from its bottom to a point slightly below the steaIn-dru m, and from that point to its upper end the thickness of said shell is reduced to provide a draft-passage P around the steam-drum L, which passage communicates with the stack Q of the boiler centrally above said drum.

The advantages of a boiler constructed as hereinbefore described will be readily appreciated by those skilled in the art, and among them maybe mentioned the following: As the products of combustion and 'heat generated inthe furnace pass through the vertical passage inthe mnd-drum and strike the inclined sides of the detlector suspended in the central conical combustion-chamber they are deflected and pass among the water-tubes. As the draft passage around the steam drum opens into the body of the boiler beyond the water-tubes therein, the heat and products ofv combustion pass around and among the different tubes and uniformly heatv the same. The steam generated in the steam-drum is superheated by the passage of the dame, &c., around said drum on its way toY the stack Q. As the water-tubes are nearly perpendicular, any sediment which may form therein will fall to the bottom of the mud-drum, from whence it can be removed throughasuitable manhole or door in one side thereof. As the central Hue or passage in the mud-drum is lined with lire-brick, there is no` danger of said drum being damaged by heat of the iiame passing through said chamber.

As shown in the drawings, the outer circle ,127-,

ol water-tubes bear against or are :inxcon-Y tact with the inner face of the lining of the shell A, se that there is no possibility of the heat passing .up along the inner wall of the boiler without circulating among the various tubes.

The outer circle h of the water-tubes H are of greater diameter than the other tubes,

by means of which a free and proper circulation of water is maintained upwardly through the smallest tubes and downwardly through the larger tubes.

I am aware that changes in the form and proportion of parts and details of construction of the devices herein shown and described as an embodiment of my invention can be made without departing from the spirit orsacricing the advantages thereof, and I therefore reserve the right to make such changes and alterations as fairly fall within the scope ofthe same. Y

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a boiler of the class described, the combination of an external shell, a muddrum arranged in the lower portion of the shell and provided with a central vertical ue or passage, a series of concentric watertubes communicating with the mud-drum, and a steam-drum supported on the upper ends of Ythe water-tubes within and out of contact with the external shell,substantially as described.

2. In a boiler of the class described, the combination ,of an external shell, a mud drum arranged within the shell at the boti tom thereof and provided with a central ver tical passage, a steam-drum arranged within and out of contact with the external' shell, and a series of water-tubes connecting the mud and steam drums, said tubes being inclined inwardly from their lower to their upj per ends, substantially'as described.

3. In a boiler of the class described, the combination of an external shell, a muddrum arranged within the lower portion of the external shell and provided with a central vertical passage, a steam-drum arranged in the upper portion of and out of contact with the external shell, a series of tubes connecting the mud and steam drums, said tubes being inclined inwardly from their lower to their upper ends to form a central conical combustion-chamber, and a deflector arranged in said combustion-chamber a short distance above the upper end of the central vertical passage in the mud-drum,substan tially as described, for the purpose specified.

4. In a boiler of the class described, the combination of an external shell, a muddrum arranged in the lower end of said shell and provided with a central vertical passage, a steam-drum arranged within and separated from the external shell, a series of tubes connecting the mud and steam drums, said tubes being inclined inwardly from their lower to their upper ends to form a central conical combustion-chamber, a vertical rod arranged in said combustion-chamber and attached at its upper end tothe steamdrum, a delector attached to the lower end of said rod, and a series of transverse braces con- Ioo IIO

meeting said central depending rod with the steam drums, said tubes being inclined ininner circle of tubes, substantially as de- Wardly from their lower to their upper ends,

scribed. v substantially as described, for the'purpose 5. In a boiler of the class described, the specified. 5 combination of an external shell, a mud- In testimonywhereof Iax mysignatnre in 15 drum varranged in the lower part of said presence of two Witnesses. shell and provided with a central vertical JOI-IN CAHALL. passage, a steam-drum arranged Within the W'itnesses: 'main shell, and a series of tubes of different; WILLIAM DOW,

1o diameters or sizes connecting the mnd and T. Y. MCCRAY. 

